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SATA SSDs are not top of the line - a 4TB nvme card is more like $3k:

The samsung SSDs have about 15% the read speed Apple is advertising.

Compare the HP EX920 (1TB for $300 on sale) to the SSD in the... 15" MBP 2017, or something.

Same AS SSD benchmark.

Now you can argue that since SSD performance increases with size, maybe that's why. Then prove it.